Modeling the heat transfer characteristics of flow melting of phase change material slurries in the circular tubes

Ma, Zhiwei; Zhang, P.

doi:10.1016/j.ijheatmasstransfer.2013.05.026

Cited by 48 publications

(8 citation statements)

References 19 publications

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“…To take into account phase change, the enthalpy method is used by taking the heat capacity of the particles as a function of temperature [20,21]. To ease the modeling of this transition, the heat capacity curve has to be approximated; for this, multiple models exist [22], as shown in Figure 1.…”

Section: The Mathematical Modelmentioning

confidence: 99%

Numerical Modeling of Thermal Storage Performance of Encapsulated PCM Particles in an Unstructured Packed Bed

2020

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In this work, a numerical model to study phase transition in unstructured packed beds of phase change particles for latent heat thermal energy storage is presented and implemented into the open-source CFDEM® coupling program. The governing equations for both fluid and solid particles are discussed. The presented model is validated using experimental data. The validated model is used to study the effect of bed structure (e.g., using multiple sizes of particles and mixing of multiple configurations of particles) on the charging and discharging of PCM bed. It is found that using smaller particles leads to faster charging and discharging of the bed. A decrease of 26% was achieved by changing half the bed into particles with half the diameter. Furthermore, it is observed that placing small particles downstream has more effect on increased charging speed than placing them upstream when charging the bed fully. A decrease of 20% in charging time and a decrease of 13% in discharging time were observed in the configurations that were tested.

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Section: The Mathematical Modelmentioning

confidence: 99%

Numerical Modeling of Thermal Storage Performance of Encapsulated PCM Particles in an Unstructured Packed Bed

2020

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“…Shabgard et al [15] proposed CFD to analyze the melting of solid particles. Ma and Zhang [16] studied the heat transfer characteristics of phase change material slurry passing through a heating circular tube under constant heat flux, and discussed the characteristics of the evolution of slurry temperature. Liu et al [17] studied CFD simulation of turbulent flow of metal bubble in an oblique blade propeller.…”

Section: S751mentioning

confidence: 99%

Heat transfer performance of thermal-washing process for crude oil pipeline

Zhao

Liu

et al. 2018

THERM SCI

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Study on the thermal wash multiphase flow and heat transfer characteristics have important significance to reduce energy consumption in wax removal. The thermal washing process of multiphase flow melting characteristics was simulated based on VOF model and RNG k-ε turbulence model. The melting temperature and pressure curves of wax were obtained under different initial conditions. The results show that the distribution of temperature in the pipe is uneven due to the action of gravity. Compared with the water temperature, the flow velocity has a greater influence on convection type. When the flow velocity is 0.5 m/s, the flow pattern of liquid wax is mainly suspended flow. When the flow velocity is 2 m/s, the wall flow is observed. The greater speed is or the higher temperature is, the faster melting rate is. The temperature increment varies with positions of the pipeline. A suitable condition for heat clean of wax was determined, which could save the cost of natural gas.

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“…Combining the methods and results reported in [32,34,[40][41][42][43][44][45], some assumptions are given as follows before elaborating the mathematical model:…”

Section: Heat Storage Processmentioning

confidence: 99%

Thermal Analysis of a Thermal Energy Storage Unit to Enhance a Workshop Heating System Driven by Industrial Residual Water

Zhao

Wang

2017

Energies

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Abstract:Various energy sources can be used for room heating, among which waste heat utilization has significantly improved in recent years. However, the majority of applicable waste heat resources are high-grade or stable thermal energy, while the low-grade or unstable waste heat resources, especially low-temperature industrial residual water (IRW), are insufficiently used. A thermal energy storage (TES) unit with paraffin wax as a phase change material (PCM) is designed to solve this problem in a pharmaceutical plant. The mathematical models are developed to simulate the heat storage and release processes of the TES unit. The crucial parameters in the recurrence formulae are determined: the phase change temperature range of the paraffin wax used is 47 to 56 • C, and the latent heat is 171.4 kJ/kg. Several thermal behaviors, such as the changes of melting radius, solidification radius, and fluid temperature, are simulated. In addition, the amount of heat transferred, the heat transfer rate, and the heat storage efficiency are discussed. It is presented that the medicine production unit could save 10.25% of energy consumption in the investigated application.

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Modeling the heat transfer characteristics of flow melting of phase change material slurries in the circular tubes

Cited by 48 publications

References 19 publications

Numerical Modeling of Thermal Storage Performance of Encapsulated PCM Particles in an Unstructured Packed Bed

Numerical Modeling of Thermal Storage Performance of Encapsulated PCM Particles in an Unstructured Packed Bed

Heat transfer performance of thermal-washing process for crude oil pipeline

Thermal Analysis of a Thermal Energy Storage Unit to Enhance a Workshop Heating System Driven by Industrial Residual Water

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